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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71604bce5845f1083290b97d79424f216cfd42e0da0ce16e576c5e7a5661e988' 
  AND token = 'Hr/3t3WhWGXltTri7EejWPPmIa63CFyMNBhzpxZDjVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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