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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f927db43919586d831686705c35982a4455854cbf1d0a745993930e205221c' 
  AND token = 'kxRldAWy8TdQ58GBj75gmjxK9Cnek2AQeCL8PSZBT/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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