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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6615ded2d0940c3dbb037e5aac083a8e9337fbbe1423577f6e319c4dce14ed76' 
  AND token = 'IP1LPpyoZ4CdS4bt/mgUC8M3+t89EdzxCewp+WVrxVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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