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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c3fa6d59aa50ad4d9475f41b283500d76de21d488baf583631cabe6ae09a66' 
  AND token = 'KkyUbjSfsrpsqH682KqLrC9ZRo6fI3UDh45tzOP37pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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