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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1cb6cadc31c23ac9496c5ac6b630e2cdafe167296fc4c16d7026d718f0859b' 
  AND token = '71TfbqLTw6sZi0hM/It6Rm3CN1b5cHFwv3eeDbGXgHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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