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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2df001b7bfd6702f7cdb447903bb8150e17e44ffb0d1dfda635d376d2a91fb' 
  AND token = 'S2j8Ye0VKx0yQv+dxH1IFZU0C9W9FJ6eSMD1ooXetn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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