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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d75d53fd020067c842250725867f118b5dfa85b5789548c509d3c6b62e735e4' 
  AND token = 'xfBPcQyqDWGkBm4rmqofouS3uraI4UcDhI5K+p3NMfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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