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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dbf70d0ee1781bd0c01d9077dcba130c3ebf4f84641936912e905fd789eaf9' 
  AND token = 'CTxg5gm1m82WkyleBNP8v+hnon+yDMy2ewqcpPvDlxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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