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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd243c756de4825ce19a45ff349e0302d3c45799e5c96c71dfb3e228e2ab0e485' 
  AND token = 'OblSHU7iHAtzdVuBUxQZl+pr6sWMA/b13YkCkO70vNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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