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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb71eee56089756d9cd611999cbbf03ab9929723e2ae56c12c17d10dc71c1dc' 
  AND token = '6XZFt3Wg7g40YaD5fhSRFFbe53iYBW3cUdYRTMCFROQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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