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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e72d07a0f481e793c3421e7dfe9ebf5a2c886e39a56a45cfde353d462d69c2' 
  AND token = 'g0csaJbwWdQMCHpxk2ol2QRftVf1EIg4rJjSyen3Ipk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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