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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9b18bd9c3e29961a9d11e8334baf06efdec093d110c6fbd12db299dcdb0165' 
  AND token = 'Inn/NwRRsD+MIPlgBU7yO51mCUiQ+AE20By9MHfDzJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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