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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b48ad0986f7aaf7c3c0fc00428fb64bb10d9663438af37afec6ca33560606c' 
  AND token = '3ftbBpZEi7JQLhskBCg9ckKxlWICHVkzduNkq7B/6Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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