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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d013870cea42e35dae55ca629aa1dc9f0e7ae4329c7f14d9be9a028cd81853' 
  AND token = 'IVxY8DYBOrVNZXHbsaV9HE8iXtqWbzO+PgC15o5r4sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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