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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13fa9781d10374cef65539e45859642a3767be111b8c4363c6d988b8762e6d57' 
  AND token = 'Efg2ZX7QoBpvta9Wh17gBovh/NG1aSsHUcWJdWyny7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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