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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700d7b4d21515e4f32981d685af598e745f91ec57d209a49a07ca363df37b862' 
  AND token = '/ye1LO5gw0G9xMUhVxiEJ2AF/kTG4wLXn+4JZnNa4Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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