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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb56e0a5395e4aa9c15be00081c343158243c0eb94ace3c517d070dc96862d9a' 
  AND token = 'RTwoE8qmpdfnQ2az+uXN/tncTezNEcy7dboWCN2jwAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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