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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90903900205eb33670bb7b24b47aa8b35b84e61df2de87ba741f615167ae9573' 
  AND token = 'BtLEoQn6wd2DWC64IdOHwBPaqg+N+l9wRfhEjvUdgRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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