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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdb2305c92f3386f1824ea8be19914012604ba7875ac03ccf3bab6374ff2a30' 
  AND token = 'l904ydZwa0YDUyi1tMMniDEES2GxUaTeD+7N4u8Sl3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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