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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ead065ea161f8b3d2d7db7e10437e2f6aa91235345db694bd2eb26f7919908' 
  AND token = 'MtMBKX153vGL64qeB6FTtbmCJqXloiZkd5ZX+aOkTuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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