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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e899036a24a85ce66a21ff4bbb90b5a0b05c5166ae5a94dee5d3d29fae3e9d3' 
  AND token = 'NXo9knvZqftBD1WDlLY3CNBcwrgcXU+ntR61DxAVWJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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