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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8585bf7af2ad5e413d310bfcd9dbd08e089afadd5c47f8827f55cafdf5ea3f' 
  AND token = 'wAJd12LT011Tcrv6DqucMtRYz2/uASsgf63t2u+EJVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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