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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990322652dc3c0d8aa60f7b6e56333e7a84f725199198e61d100b95bb421614e' 
  AND token = 'b57elcBWkKO4frkKUysMdM9llwAsViakB2FNKWojXVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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