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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbf1b003bf4e3e43e898d62f9b62f81aa6edc5a25188705b31779755ea25735' 
  AND token = 'q9FPeSc9gM/tEzY/R1rHgspC9PRX+dtCmGh091tsaq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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