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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b829cee50da07a52314d79e81e2570cd69db5212855af015240464adb6db8419' 
  AND token = 't7T+m29lcfiQ7SraODxaVEecuJowwY5fsWzigWWaVZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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