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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd008c13b975b4e7f6a7f2a204a4e6587329ab50b8f63aa52e7b680a9eb6b2690' 
  AND token = 'zx5Hbm499gZ9a7MxkkniMrr/8oT9jhu6iiJVykzfm9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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