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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fd65dbb90273cf330cb802d68820393cbf8572844842a3479b78bc554b1315' 
  AND token = 'E7TQBqcCQQ9VYmieHbhRF16IBW8oCBGZDh6gsFAYsx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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