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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfcd5e32ab9975d61b9242aa5b8559626bf3cb0630d643d2a3c35f126733200' 
  AND token = 'B11+dwOzUR8PJDfv8QU0abGc580e8tZvuB1Qt5iLooU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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