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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83572d3bab601945e0f4fdccccf1af0cdda295491b74b93c0c047c4f11f296fc' 
  AND token = 'wzit4zkTiFCK1+Peez8spAgwPl/r6c24sIAooqrgsaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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