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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49792bffde8a9f62e75619fa7ab67981b6c2ba71be9b8e7646ba67b19dfa0e86' 
  AND token = 'gJrzkPtr58pDQY8y0YoI3tArX9aBEY9kTaNbSKMS9II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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