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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc2d64a9f369c362a6d492fe9021bd0fe2d0ac94bc067fdc884111375707bdb' 
  AND token = 'yGkF86kjJhf6yawCm9gEmcZ5q71DYCHlJIzENEQMRWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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