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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef79f623d9017d53c6e55ff4851586c1ab09861d2cf56d05cc9e56ec3cae26f' 
  AND token = 'McwU1ibkdspWNRM3uQNtaGA1icQO4Z/eyD45fZRpky0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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