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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd1ec2ffcd58b47b7860f51c05796dc4a67f265b50ccf002037ea2171fea71b' 
  AND token = 'KBduH+oX7awWEuuxgzhK8c6YgOBNXYXuK5xIw1MFa/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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