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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8524aa1f95a62d8227ecd6150e68931197516fd2c70617d5c890c313bc91f659' 
  AND token = 'femBAkfyT0svmi9O0ji8HZOTc2dla5A9Hm3Ntiwn/8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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