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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5bc0a3278cf052031f9821a40da26ef7c9b1e777ac6d7bd1c0cb61b40b5fcc' 
  AND token = 'XMnrSebQUgXN8G5aKddhHaKg0jzonlsun33/hw6srUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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