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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fef425e1e20db1ef3386ca25eeba9ab5756b34507a1fdb035f85cfdeb6bf2a6' 
  AND token = 'be6nzJNLCvI/8UrsK2JTUGz32neM3xs3gbqPJfG72S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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