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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85895d9a21027637b3b17fd565adb8e28f612ea3ff2f78141526c5f8de66ad5' 
  AND token = 'QiuKZ4k1TY1haLMbd9hYax+BTsnXWTiUMOxsAFtohjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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