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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb885a00015750c4cbbb3590f1c8a69d36438344ae6a7160a7066cbacb17e7f8' 
  AND token = 'FC/kbuxrcus03oIw1V4SOqNBJ+TLc+ozivBixFvutB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}