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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1d96e08e355a539114f4d0e292e2abc05e56f82f5722bd1f83c350e6283a06' 
  AND token = 'eix/+o+L27iSad6yl4/O4DIap1mfrjYw1L+uxEtumZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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