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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b815bc918244fcd8108583890f32b8de6113bfee681a2019ee751104053a39f' 
  AND token = 'yR0MAMSZYAHe5k81tomWWsQQKO7C+iuPfVvFVxiwbA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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