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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3488c23011d586316eb41fb90fe01e8af4211c5b3490e704b1b721c8b11030d9' 
  AND token = 'OgqSaztJ0Dhwio7nyFtiTZ0R1P+yEyXq7VzKNH9iM+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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