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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de45914777262414afe1a70e59bd5be2f34d0d46793247998d99db9a73d5212' 
  AND token = '9xm8ND6jk79BGe6arlUCJrJ5dJO28t9RJ/NnYjnowT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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