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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c02aea97da836344ca5c0f9980aab752874192491cbe9c1acb15bf69edd1450' 
  AND token = 'pann5n4uTs2jYoj0to2a1s9mXEaxDpAm9lPmoSnnlUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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