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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7722a95c611a317d0f7b0150e886ef171f32ff4ac728224de9ecc9a87ee6bb' 
  AND token = 'szvy242qIc5dB7eyyKWqMW8sNK6qy3ySIBpY0h3ggKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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