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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0146e8e9273c6f1648e6b870772d043b1dc5931689af6898fd9c7923071107b8' 
  AND token = 'yCAagP3fnHwvcXhib5BhJN0Av+RYKhgR779J8LbONLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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