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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9be45fa261dc901743bff1520505d5d849027b89e2535a55d82deb874501d8' 
  AND token = 'tY5tGETlIAWPezp7ibvuiT7eHSxB1seiWy+FAUxnNvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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