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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88143a87e460eb3414677a4988060eb7e9d350a00103a3de1cea1edc5146640a' 
  AND token = 'FTS9K91yBYg5Igu8p/F4sN4zFsowmhYj/jdWvxgwa30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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