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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7bba8b210e72c2388d93003ec88321c479786553d76ccefe4ba98fe47fbe75' 
  AND token = 'm3c1YIUQzh061OcDeQu+HW6d8CN+pk0FKVz//j1cfB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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