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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a3ec8f4db5b38fb5e6cf06ed4114a7ae19a7506127c7262ed9040fc25c346b' 
  AND token = 'aczdHuHIUE5ux/+7v2mahi5hFmybhnfxrT2s6l0ouK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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