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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12968f3435f7684f4a6e67c2a1c4f7fea03c672abbbbb7c43e0198bf92eaf49' 
  AND token = 'B6O9bIHjsVz8Exmt9UQMwU/iVNX0t+Czs7Xac4scQ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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