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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2eafc8cc155c56c53a668cf4a871913bab7c2e568a178b1d6b5f6e1d449144' 
  AND token = 'jaWbmu+xGPdskEKv5WS+0pHDifpm4/TwzJMz/MjbFuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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