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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17f41ba862dcef3752f112d9dd79317dbc2d567c8b26049d7b163a9e98da0f1' 
  AND token = 'Pt1nLIDURwaTl47niuGIFEg3hljSRQFzT3DwbQqxrmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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