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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdeb64aeb3c679eef5f9de99cd1e56c0c916857114aacb40e276a7a1b90167d' 
  AND token = 'oktkZxVD+FfmIFHl4F1AcX7hzTGilT1TysdKZ40BuAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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