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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55f313fe43016c7d590f9beecc3da77ac9a875f9b432f1e841d9bc656c59b29' 
  AND token = 'ooQ+JZDzEwz8NS4itwH3Al1T9M1yLTTWwa6CTTmRlpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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