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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfba19ef3f3f7141671b939a853bcbf64b8e8e00e4db6f670d44efebe9c3769' 
  AND token = '/7PPAen+K9u/ygjiqf7D2/SEuVjk2GreDqmX9ciquS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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