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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99b1bae834ab6c40d629c54d4a57fc4ecbc8dc56a470293c2d2cd66c210f3a6' 
  AND token = 'ywBgZQPfexchCIxxICo2gXd9l3++9Cc/49K1TBAb+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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