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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb771886fcb64f8aeda7bbd6cc2d03e717fdced5886c3158aaef938ad7a208e5' 
  AND token = 'BTpHaWe1Jw4oN9O1F6Yc2U9TvWtkw45cMqXfpnw8RjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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