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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7ffc69b35c58a346835a9635315a870f77dd3839a6e93c966291bbfce8492e' 
  AND token = 'crDqYVAowKPOdaYpgskl73dhjezzv3sEb+9IkbcX1w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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