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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a019c562624dadbe29f438c91f8418f12197c302b5055112d545c41e42d12' 
  AND token = 'JOtKjEvcKbcJvZ7WD0q7h/wakgZxb45u9RoikoETFVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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