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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b57cda9b11d3443a1fc91ce0a313567d08d6dbba6bdaa0996d15ba994f095f5' 
  AND token = 'ThhDBl57EMU5uRwgq0vELrv1Of+C97BJo3xr1guzm30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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