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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071d38b1c89105cc3f82edf02b838a77ef44673f41bdac218c20ee8fa4cd984a' 
  AND token = 'vHmccTfpUavTFzUb+ht8syZwOEHvS5l4MQCrpm20BsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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