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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3440cd6fd17f0d5107c9b545565a6ef0b1c89565778de372b73f2b8c7eef4aeb' 
  AND token = 'q6qcS8hVzU7NPzLp7g30c8j92I9mRDVfwmdSu9RMl+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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