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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93af454c146cb1e0737e47da0df0d27ca9827000e97c290e92c524c9a6fb20bb' 
  AND token = 'iKz1gf2llYQ/QX4gaPQIuyTvJD1+dwh926oNI26KXsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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