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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dfaf3d93fbc84b9975c7473ec3560dbbc98c64d03407fc8154ec0f73d98bd6' 
  AND token = 'jwzBOzx5onhMxMRArabpx/bFJjxPLLe7W/639nHnPmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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