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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550a9e03151f9f8a8ab77590856d38488911671b3d65e8ea631f03a55f980e99' 
  AND token = 'QV7w/mTNS+/zZLWQhlyK7TWmyM1z29tqRTTKa8Vd2S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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