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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677811236320ad46923b16800f550b31539755154d70b440512a9bafc4e1e3fc' 
  AND token = '6tpTT/Ag0F4Mu1rSllD+pkRwk4gVOraUKZ9l8LNOyNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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