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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeff0e36d37565ef7e6ddbb52fa6eaa09ec712c5af6021772bec0abfe60b35f7' 
  AND token = 'UGqeuM5ju/d8gPhh6KtQxNnHurXWkHrXcof1Z5g/tF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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