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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a1c687a3eeff66031bea2db4829984e2836def8d5fba41f5efe23ba4751e71d' 
  AND token = 'x7fPI2P4/bmS16ruxxPQX47oiAaUjBoflK6Xvor3ZqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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