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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90fd9456a90396db20c439bc351b03d7a53cf7e8478eb4a4ea43d5baac5c519' 
  AND token = '8dNx2VCCbx4e09bM/bBaTpZ0ILmzdawYRp41c4xx9YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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