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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5554ef16692ab09d49a3f5060602263e17988ea6a9c12ed7f0a49f7505ceb4' 
  AND token = 'hVyXLE44F9iI6c8lIcAElPuz7FhmVPrz02RMLJsb3UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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